Poff ("Ping and Off") is a system daemon that shuts down slave computers (which it is installed on) when the master computer is switched off (and therefore doesn't respond to pings anymore). It can be used to switch off numerous computers like in computer labs without having to walk up to every single lab computer.
Every slave computer sends one ping packet (9 bytes) per minute, so there's not a lot of network chatter. Temporary network outages have no impact, see the new and improved documentation embedded in the software package for details.
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